/Engine/Source/Runtime/Engine/Classes/Components/PrimitiveComponent.h
Changes the current PhysMaterialOverride for this component. Note that if physics is already running on this component, this willnotalter its mass/inertia etc, it will only change its surface properties like friction.
virtual void SetPhysMaterialOverride ( class [UPhysicalMaterial](API\Runtime\PhysicsCore\PhysicalMaterials\UPhysicalMaterial) * NewPhysMaterial )